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A hollow-cathode device has been shown to operate as a plasma reflector for electronic steering of radar beams using helium in the 0.2–0.5 Torr pressure range. Compared to previous experiments, the use of this light gas significantly reduces the spurious sputtering effects on the cathode materials. A semi-quantitative physical model was developed to… (More)
Adolescents' access to contraception has improved and indication for their use have been extended beyond pregnancy prevention. For adolescents, this implies the use of hormonal contraception before the accrual of peak bone mass. Sexual hormones, notably estrogens, play a major role in skeletal development, growth and acquisition of maximal bone mass density… (More)